Pump



Dec. lo, .1929,

E. M. SCOVILLE PUMP Filed Oct. 20. 1924 2 Sheet's-Sheet l Dec. l0, 1929 E. M. sovlLLE L733734 PUMP Filed oct. 20,` 1924 p 2 sheets-sneu 2' Patented Dec. 1o, 19

lUNITED9srl-nfifi-:S

EUGENE il. scovnmn, oir 'mwanxnn w1scoNsiN,AssicNon or' ONE-mir 'ro norm-L. swANnnne, or rir'rsnnnei, PENNSYLVANIA PUMP This invention relates in general to iinprovements in the art of propelling fluid by positive displacement, and relates more specifically to improvements in the construc-A tion and operation of single and double act# ing reciproca-ble positive displacement pumps for iiuids. .A

A general obj ect of the invention is to provi'de an improved pump structure which is 10 simple in construction and eicient in operation.

Some of the more important specific objects and advantages accruing from the present improvements, are as follows structure which may be readily and quickly converted from a single acting unit into a` double acting unit of increased capacity, and vice versa. v v

To provide a compact and efficient. pump having relatively large and conveniently variable capacity.

To provide improved liquid pumping mechanism which may be` manufactured at minimum cost, and all portions of which are easily accessible for machining.

To provide'a pumping device in which similarly functioning elements are identical in form and are therefore interchangeable.

To provide an improved pump structure every part of which is readily accessible an quickly removable, and which may beconveniently. assembled or dismantled.

v To provide improved casing, plunger and valve striictures for reciprocable liquid pumps.

To provide improved means for insuring proper lubrication of pumping machinery.

To provide other improvements in the de- To provide a simple and ingenious pump.

l proved liquid pump.

tails of construction, assemblage and oper- Application led October 20,1924. Serial No. 744,602.

closed but ngt specifically claimed herein, form the subject of al copending application Serial Number 741,881, filed October 6, Y1924.

A .clear conception of embodiments ofthe several novel features constituting the present improvement, and of the operation and `mode of assembling and' dismantling 'devices constructed in accordance with the invention, maybe had by referring to the drawings accompanying and forming apart' of this 60 specification in vwhich like reference charaeters designate the saine or similar parts in the various views.

Fig. 1 is a central vertical section through i an improved liquid pump assembled as a single acting unit. v

Fig. 2 is a' side levation ofthe improved liquid pump assembled as a single acting Pump l Fig. 3 is a part sectional top view of the 70 improved liquid pump with the top casingsection removed. Fig. 4 is a'transverse horizontal section through the lower casing section of the iin.-Y Y l Fig. 5 is an end elevation of the improved liquid pump assembled as a single acting unit and having a continuous rotary drive applied thereto.

Fig. 6 is a transverse central vertical sec'- 80 d tion through an improved liquid pump converted into a double acting unit and having an oscillatory drive applied thereto. Fig. 7 is a full top viewvof the improved liquid pump converted into a double acting 35 junit.

Fig. 8 is a fragmentary side elevation of the improved oscillatory pump drive.

9 is a top view of one of the elements of the improved oscillatory pump drive. 90.

The improved liquid pump specifically shown in .the drawings comprises in general amaincasing consisting of a lower or base section 2 and an upper or top section 3 having vertical alined bores therein; rigidly connect- 95 ed lower and upper plungers 5, 4 snugly fitting the bores of the casing sections 2,3,respec-- tively; a' plunger actuating cam 6; coacting with end surfaces of the plungers 4, 5 between the-bores in the casingsections 2, 3; a hori- `100 PATE-Nr 0IA-"Fics" y zontallydisposed main drivin shaft 7 sup` ported in bearings 23, 47 detac ably secured4 provided with a sole platel and aV lower displacement chamber 22 below theend ofl the vertical bore therein, and has inlet and dis` charge chambers 46, 43 respectively which are communicable withy the displacement chamber 22 through a common passage 13. f` 'An inlet or suction pi e 8 is 1n open communication with the 1n et chamber 46 and a spherical suction valve 10 controls the passage of liquid from the chamber 46 tothe passage 13 and chamber 22. An outlet or discharge pipe 9 is in open communication with the discharge chamber 43 anda spherical discharge valve 11 which coacts with a removable seat 17, controls the delivery of liquid from the passage 13 to the chamber 43. The valve seat '17 provides a stop for limiting the opening movement of the suction valve 10, 'the valve 10 being freely vertically removable upon removal of the seat 17, and the seat 17` and the discharge valve `11 being freely vertically removable upon removal of the plug 18 which normally encloses the chamber 43 and forms a stop for limiting the opening movement of the valvel 11.

The base section 2 and the top section 3 of the casing are detachably connected by means screws 42 and cooperate to form a of cape cham r 41 between the plungers 4, 5. The top section 3 of the casing is provided with an upper displacement chamber 44 which is normally closed by means of a solid plug 21 when the pump is assembled as a single act-l ing .unit. The base section 2 of the casing is provided with an opening 15A communicating with the chamber 41,'this opening/being nor mally closed by means of a pipe plug 16 when the pump is assembled to operate slngle acting. The top section 3 is also provided with a' horizontally bored lug 12, the function of which will be later explained.

The lower pump plunger 5 which cooperates with the lower displacement chamber 22 is formed solid, while the upper pump plunger 4 which is adapted to cooperatewith e the upper displacement chamber 44 has a vertical central bore 20 and a transverse passage 19 formed therein. The bore 20 and the passage 19 provide an open conduit connectlng the chambers 41, 44 when the `pump is assembled to operate single actin The plungers4, -5 are rigidly connecte by means of connectors 14 and are freely removable from. within the main casing upon removal of the screws 42 and separation of the sections 2, 3'.

The plunger actuating cam 6 located. Within some distance beyond the stuffing box 48.

rJhe bearings 23,47 are interchangeably cooperable with threaded openings formed in opposite sides of the base section 2, therebyv permitting reversal of the shaft 7 relatively to the main casing4 When the pump is assembled for o eration'as a double acting unit as shown in igs. 6 and 7, a suction pipe connects with the opening 15 in the lower section 2 and a spherical suction valve 24 is disposed within the bore 20 of the hollow plunger 4. The solid plug 21 isreplaced by a discharge valve cage 26 within which a spherical discharge valve 25 is located. A discharge pipe 28 is connected-to the valve cage 26 by means of a fitting 27 which besides forming a stop for limiting the opening movement of the valve 25, permits access to the valve. 1

The oscillatory driving mechanism for moving the cam 6 to reciprocate the pistons 4, 5, shown in Figs. 6, 8 and 9, comprises a slotted adjusting quadrant 31 keyed to the outer end of the shaft7, an actuating arm 29 pivotally supported by the shaft 7 and ad- ]ustably secured to the quadrant 31 by means .of a locking cap screw 32, a bifurcated connection 30 formed for pivotal connection with any one of several openings 39 of the lever 29 by means of apin 40,'and a recipro-v 12 of the top casing section 3, and a nut 36 for locking the bushing 35 inposition.

During normal operation of the pump as a single acting unit, the structure is assembled as shown in Figs. 1 and 2 and may have either the oscillatory or the Continous rotary drive applied. As the cam 6 is moved, it coacts with the adjacent end\ surfaces of the plungers 4,'5 and'produces simultaneousbut opposite reciprocation of these plungers in the respective bores of the casing sections 2, 3. The reciprocatin solid lower plunger 5 alternately enters and7 recedes from the lower displacement, chamber 22 thus drawing liquid from the 'pipe 8 through the chamber 46 4 and past the suction valve 10 into the passage 1o the chamber 41, passage 19 and bore 2O past 13 and subsequently forcing the liquid past the discharge valve 11 through the chamber 43 and into the discharge pipe 9. ',flh'e reciprocating hollow upper plunger 4 is inactive with the elements thus assembled. If the structure is assembled for double acting operation as shown in Fig. 6, the reciprocatin hollow upper plunger 4 becomes active a n alternately draws liquid from the pipe which communicates with the opening 15 through the suction valve 24, and subsequently forces the liquid from the displacement chamber 44 gast the discharge valve 25' into the upper.

ischarge pipe 28. It will thus be apparent that the structure is readily convertible from -single acting with only the lower plunger -5 lized to urge different kinds of liquid, but

the discharge pipes 9, 28 may be connected to cause both plungers to pump against a common head. The various elements of the structure are obviouslyl conveniently machinA able and the entire mechanism may be quick- `ly assembled or dismantled. The liquid pumped may obviously b e oil, in which case the plungers 4, 5 are effectively lubricated by the oil passing through the chamber 41 to the upper displacement chamber 44.4 The capacity of the unit may be readily varied by varying the speed of operation or by changing from single to double acting, and the stuhing box 48 effectively prevents escape of liquid from the chamber 41.` Either type of driving mechanism may be applied to the pump thus permitting utilization of either reciprocating orrotary power.

It should be understood that it is not de-l sired to limit the invention to the exact details of construction and operation herein shown and described, for various. modifications within the scope of the claims may occur to persons skilled in the art.

It is claimed and desired to s ecure'by `Let- 1. In combination, a casing foimiiigd a pair 'of alined displacement chambers an an en- `larg'fed intervening space, rigidly-connected' plungers movable within said chambers and having parallel adjacent end surfaces within said space, one of said and the other having a ongitudinal passage connected with said space by a lateral passage plungers being solid disposed closely adjacent to said end surface thereof, rotary means within said space and cooperable directly with said end surfaces to reciprocate said plungers in' said chambers, inlet and Adischar e valves in said casing for controlling the gow of iiuid 'to and from plunger, conduit means for admitting Huid to said space, an inlet valve within said pas-` sage of said other admission of iiuid rom said space `,to the displacement chamber of said other plunger, an a discharge valve associated with said casing for controlling the delivery of fluid from the displacement chamber of said other plunger. r

2. In combination, a sectional casing forming a pair of alined displacement chambers and an enlarged intervening space, the sections of said casing being separable at said space, rigidly connected plungers movable within said chambers and having adjacent end surfaces Within said space, one of said plungers being solid and the other having a longitudinal passage connected at one end with said space, rotary means within said space and cooperable directly with said surfaces to reciprocate said plungers in said chambers, an inlet valve in said casing forv controlling admission of iuid to the displacement chamber of said solid plunger, conduit means for admitting uid to said space, an inlet valve within said passage for controlling admission of Huid from said space to the displacement chamber of said other plunger, and 'valve means associated with said casino' for controlling delivery of iuid from said chambers. i

3. In combination, a casing formin a pair of alined displacement chambers an an intervening space, ,interconnected plungers movable within said chambers and having lunger for controlling .the displacement chamber of said solidv adjacent end surfaces-within said space, one

of said plungers being solid and the other having a longitudinal passage connected at one end with said space, rotary means within said spaceand cooperable with said surfaces to reciprocate said plungers in said chambers, inlet and discharge valves in said casing for controlling the iiow of fluid to and from the displacement chamber of said solid plunger, condut means for admitting fluid to said space, a freely removable inlet valve within said passage for controllin admission of iiuid from said space to the isplace-l ment chamber of said other plunger, adischarge valve detachably associated' with an opening in said casin for controllin delivery of iiuid by said-ot `er plunger, an meansl ing conduit means communicating with the space betweensaid chambers!z lungers simultaneously movable within sal chambers, one

of'said plungers'bein solid and the other having a longitudinal. passage communieating at one end with said conduit means and at its opposite end with an opening in said casing, means within said.- s ace for rel f oiprocating said plungers in. sai chambers,

in et and discharge valves for controlling the flowof fluid to and from, the displacement chamber of said solid plunger, a freely removable ball inlet valve for 'controlling 'admission of fluid from said conduit means to the 'displacement chamber of said other plunger, a discharge" valve detachably vassof opening for con-A oiated 'with said casin trolling delivery of uid by said other plunger, and means'for sealing said conduit means and said casing opening when said ball valveis removed; p

In testimon whereof, the signature of the inventor is a xed hereto.

EUGENE M. scoviLLE. 

